3v4l.org

run code in 300+ PHP versions simultaneously

@ 2013-07-29T11:40:02Z

<?php

/*
$string = 'This is my encrypted string!';
$key    = 'KEY';
$split  = str_split($string, 3);

foreach($split as $chars)
    echo bin2hex($chars ^ $key);
*/


function hamdist($a, $b)
{
    $a    = str_split($a);
    $b    = str_split($b);
    $len  = count($a);
    $dist = 0;


    for($i = 0; $i < $len; $i++)
    {
        $bits['a'] = str_split(sprintf('%08d', decbin(ord($a[$i]))));
        $bits['b'] = str_split(sprintf('%08d', decbin(ord($b[$i]))));

        for($x = 0, $len2 = count($bits['a']); $x < $len2; $x++)
            if($bits['a'][$x] != $bits['b'][$x]) $dist++;
    }

    return $dist;
}


$enc = hex2bin('1f2d3038653038653432653c25262b32352d2e217938312b222b3e6a');

for($keysize = 2; $keysize <= 15; $keysize++)
{
    $blockA = substr($enc, 0,        $keysize);
    $blockB = substr($enc, $keysize, $keysize);

    printf("(Keysize = %d)\t%.2f\n",   $keysize, (hamdist($blockA, $blockB) / $keysize));
}

Output for git.master, git.master_jit, rfc.property-hooks: (Keysize = 2) 4.00 (Keysize = 3) 2.00 (Keysize = 4) 3.75 (Keysize = 5) 3.80 (Keysize = 6) 1.83 (Keysize = 7) 3.57 (Keysize = 8) 3.25 (Keysize = 9) 2.89 (Keysize = 10) 3.00 (Keysize = 11) 3.27 (Keysize = 12) 3.08 (Keysize = 13) 2.85 (Keysize = 14) 3.29 Warning: Undefined array key 13 in /in/1RGrN on line 24 Deprecated: ord(): Passing null to parameter #1 ($character) of type string is deprecated in /in/1RGrN on line 24 Warning: Undefined array key 14 in /in/1RGrN on line 24 Deprecated: ord(): Passing null to parameter #1 ($character) of type string is deprecated in /in/1RGrN on line 24 (Keysize = 15) 2.93

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

preferences:dark modelive preview

39.33 ms | 402 KiB | 8 Q